基于SIMO的燃料组件模态试验研究

Fuel Assembly Model Test Based on SIMO

燃料组件的结构模态频率和振型反映了其自身结构的固有特性,其结构的损坏会降低燃料组件工作的可靠性,是出现工程事故的主要原因之一。利用单点激振多点输出(SIMO)试验模态方法,并基于LMS模态分析软件,对某型号燃料组件进行了锤击法模态试验。以单激振力为输入信号,多个加速度传感器的加速度信号为输出响应,获得了该燃料组件的各阶模态参数和振型。

Model frequencies and model shapes reflect the inherent characteristics of one kind of fuel assembly. The breakdown or damage of fuel assembly have bad influence on its operation, which is one of the most important reasons for the engineering accident. Based on the multiple curves fitting of transfer function using LMS model analysis software, a hammering test of Single-Input Multi-Output （SIMO） analysis method have been performed on a kind of fuel assembly. The orders of mode frequencies and model shapes were obtained by the test as force to be single-input, and multiple accelerometers to be output. Comparing to the calculation modal, the test results are proved to be validity and reliability.